/// Copyright (c) 2019 Razeware LLC
///
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to deal
/// in the Software without restriction, including without limitation the rights
/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/// copies of the Software, and to permit persons to whom the Software is
/// furnished to do so, subject to the following conditions:
///
/// The above copyright notice and this permission notice shall be included in
/// all copies or substantial portions of the Software.
///
/// Notwithstanding the foregoing, you may not use, copy, modify, merge, publish,
/// distribute, sublicense, create a derivative work, and/or sell copies of the
/// Software in any work that is designed, intended, or marketed for pedagogical or
/// instructional purposes related to programming, coding, application development,
/// or information technology.  Permission for such use, copying, modification,
/// merger, publication, distribution, sublicensing, creation of derivative works,
/// or sale is expressly withheld.
///
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
/// THE SOFTWARE.

import UIKit

final class ST_SlideInPresentationAnimator: NSObject {
  // MARK: - Properties
  let direction: PresentationDirection
  let isPresentation: Bool

  // MARK: - Initializers
  init(direction: PresentationDirection, isPresentation: Bool) {
    self.direction = direction
    self.isPresentation = isPresentation
    super.init()
  }
}

// MARK: - UIViewControllerAnimatedTransitioning
extension ST_SlideInPresentationAnimator: UIViewControllerAnimatedTransitioning {
  func transitionDuration(
    using transitionContext: UIViewControllerContextTransitioning?
  ) -> TimeInterval {
    return 0.3
  }
  
  func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
    let key: UITransitionContextViewControllerKey = isPresentation ? .to : .from
    guard let controller = transitionContext.viewController(forKey: key)
      else { return }
    
    if isPresentation {
      transitionContext.containerView.addSubview(controller.view)
    }

    let presentedFrame = transitionContext.finalFrame(for: controller)
    var dismissedFrame = presentedFrame
    
    if direction == .none && isPresentation == false{
        
        UIView.animate(
            withDuration: 0.1,
          animations: {
            
            controller.view.alpha = 0
            
        }, completion: { finished in
          
            controller.view.removeFromSuperview()
            
            transitionContext.completeTransition(finished)
            
        })
        return
    }
    
    
   
    dismissedFrame.origin.y = transitionContext.containerView.frame.size.height

    let initialFrame = isPresentation ? dismissedFrame : presentedFrame
    let finalFrame = isPresentation ? presentedFrame : dismissedFrame

    let animationDuration = transitionDuration(using: transitionContext)
    controller.view.frame = initialFrame
    UIView.animate(
      withDuration: animationDuration,
      animations: {
        controller.view.frame = finalFrame
    }, completion: { finished in
      if !self.isPresentation {
        controller.view.removeFromSuperview()
      }
      transitionContext.completeTransition(finished)
    })
  }
}
